Automatic stoker.



W. T. HANNA. AUTOMATIC STOKEIL APPLICATION FILED 001'. 10, 1905.

Patented Dec.27,1910.

3 SHEETS-SHEET 1.

Wz'inesses.

W. T. HANNA.

AUTOMATIC STOKE-B.

APPLIOATION FILED 00w. 10, 1005.

Patented Dec. 27, 1910.

3 SHEETS-SHEET 2.

.lnveni'or Wz'ZZz'am Thanna By? fl z 4 Wz' Znesses fiiforneys W. T. HANNA.

AUTOMATIC STOKER.

APPLICATION FILED OUT. 10, 1905. 979,849. Patented Dec. 27, 1910.

8 SHEETS-SHEET 3.

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UNITED STATES PATENT OFFICE. wILLIAm r. HANNA, or CINCINNATI, onIo, AssIGNon, 5y MEsNn ASSIGNMENTS, TO THE MEoHA IcAL CONSTRUCTION COMPANY, or cINcIN A'rI, 011m, A conro- RATION OF OHIO.

AuromA'rIc STOKER.

Specification of Letters'Patent. Patented Dec. 27. 1910,

Application filed October 10, 1905. Serial llIo. 282,142.

To all whom it may concern:

Beit known that I, WILLIAM T. HANNA, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Automatic Stokers, of which the following is a specification.

The object of my invention is-to provide an improved stoker for automatically feeding fuel to boiler furnaces.

My invention consists in the combination and arrangement of parts hereinafter described and claimed.

In the drawings Figure 1, is a vertical section through the "feeding mechanism of a stoker embodying my invention; Fig. 2, a top plan view of Fig. 1, partially in section; Flg. 3, a section on line 33 of Fig. 1; Fig. 4, a section on line 4.t of Fig. 1; Fig. -5, a perspective view of the firing or distributing plate; Fig. 6, a section on-line 6-6 of Fig. 5; Fig. 7, a perspective view of a modified form of firing or distributing plate; and Fig. 8, a section on line 88 of Fi 7. I

Aafoor plate A is mounted in any suitable manner, in front of the usual furnace door opening and provided with an opening a communicating therewith. In front of plate A, a blast casing B is mounted with its blast discharge 1) projecting through opening a, well within the furnace door opening. This blast discharge consists of a supply throat b terminating in a central port 6 and larger diverging side ports 5 which lead into a chamber 6*. The chamber 6 is angular in form, each angular arm of which-is set at right anglesto ports 6 as shown in Fig. 4. Adjacent to the ports, this chamber is of considerable height, slopes abruptly to the discharge slit 5 which is also angular in form wlth its angular arms set at right angles to ports 6 supply opening 6 leads from throat I) to a suitable valve (not shown) for supplying intermittent blasts of steam, or other. gas under pressure, as will be readily underl stood by those skilled in the art. By this arrangement the blasts from throat I) are delivered to chamber 6 in the form of a powerful divergent blast to either side and but these blasts expand to some extent and pass out through s b in the 'form of a thin sheet retaining, to. a large extent, the initial direction and distribution of power' imparted by the ports. The elfect of this construction is to deliver a sheet or fan like blast, the sides of which are formed by the comparatively powerful divergent blasts from ports 12 and the-eenter by the weaker anddirect blasts from port 72 Thus it will be seen that a blast in sheet form and having comparatively powerful and divergently directed sides and a weaker .-and direct center, is discharged across the distributing plate. I I

A distributing plate 0 is secured to plate A by means of arms a and lugs a in such manner as to extend into the furnace immediately in front of and below the blast. The central portion of plate C is unobstructed and slopes slightly to eitherside from a medial line. In the sides of theplate are divergent channels 0 "lying beow the central ortion. At its'inner edge,

immediatelyin ont of slit the plate 0 is provided with a wall 0 commencing flush with the plate at the center, and rising gradually to the outside edges of channels 0 The channels a? commence at the foot of this wall, comparatively shallow and deepen as they extend'outwardly until they are of considerable de th at their outer en'ds, their walls being slightly inclined to the vertical. At their outer ends, the channels turn somewhat abruptly to a direction substantially at right anglesto the general direction of the plate.

Above the blast casing B, is mounted a feed plate D, which is in the form of an inclined ridge, having directing guides d pivoted to the ridge sides. The guide piv- 015$ 03 extend through the ridge sides, perpendicularly, andcarry handles d by means of which the guides may be rotated to different positions on the ridge sides. A feedpan E is mounted above feed plate D and is adapted to'direct its contents thereon. I In Figs. 7 and 8 I have illustrated a modi 'fied form of distributing plate G which? jmay be used with good results. Here the side channels c 'have not as prominent interior walls noris the turn at the outer endof the channels quite so abrupt,-and the cen} I tral portion is given aslight forward slope.

In operation, coal, or other fuel,-is supplied to pan E by any suitable form of feed hopper, or by hand, if desired. The coal asses from pan E onto feed plate D whence it flows down onto plate 0. It will be seen that with uides d in the position shown in full lines in Fi 2, the stream of coal will divide on the ridge of plate D, part passing to one side and part to the other, so that the bulk of the coal will be directed onto plate C directly in the path of the strong divergent portions of the blasts from slit b and into channels 0 The combined effect of the blasts and channels is to throw the coal toward the sides and rear corners of the fire box adjacent to the door. The coal actually entering the channels, strikes against the outer abruptly turned walls thereof and is distributed into the rear corners, while that which passes out over the channels, is distributed toward the sides and farther forward, some of it striking the walls and rebounding toward the central portion of the fire bed, a result which is facilitated by the slope of the central portion of plate 0.. By raising one of the guides and depressing the other substantially all' of the coal may be directed to one side or, the other of the fire box, or by raising both guides, substantially all of the coal may be directed to the center of the fire box. Thus it will be seen that the distribution of the coal is placed entirely, under the control of the operator, who may direct it to those portions of the fire bed where most needed. Owing to the fact that the distributing plate is set slightly below the slit b the main force of the blasts will pass over the plate slightly above its upper surface and strike lumps of coal thereon near or above their centers of gravity and thus project them in a horizontal and downward direction, in-

stead of projecting them upwardly as is the case when the main, force of the blasts strikes the lumps below their centers of gravity. '1 have found by experience that when the coal is thrown up to any considerable extent, above the plane of the distribut-' ing plate, the finer particles are liable to be drawn into the boiler flues and choke them up. By setting the distributing plate below the blast, and employing a comparatively weak central blast, I prevent this choking up of the flues. The walls 0 v insure that some of the coal will fall well within the channels 0 before being struck by the blasts and their direction thus fully controlled by said channels.

The distributing plate C illustrated in Figs. 7 and 8, operates in substantially the same manner as the one just described, except that the absence of walls 0 causes a little less coal to be projected to the sides and rear corners, and the forward slope assists in preventing the coal from being projected into the air.

While I have illustrated and described the preferred construction for carrying my invention into efiect, this is capable of modification without departing from the spirit of the invention. Itherefore do not wish to be limited to the exact construction shown, but

What I claim as new and'desire to secure by Letters Patent is;

Y 1. In a blast feed stoker, a feed plate angular in cross section, and having its sides sloping downwardly from the median line, in combination with guide wings, adjustable upon the sloping sides of the plate, substantially as specified.

2. In a blast feed stoker, a feed plate angular in cross section, and having is sides sloping downwardly from the median line in combination with guide wings independently adjustable upon the'sloping sides of the plate, substantially as specified.

3. In a blast feed stoker, a feed plate angular in cross section, inclined from the receiving toward the discharge end, and having its sides sloping downwardly from the median line, in combination -with guide wings adjustable upon the sloping sides, substantially as specified.

4. In a blast feed stoker, a feed plate angular in cross section, inclined from the receiving toward the discharge end, and having its sides sloping downwardly from the median line, in combination with guide wings independently adjustable upon the sloplng sides, substantially as specified.

5. In an automatic stoker, a blast casing Having a supply throat, a central port and diverging side ports leading from the supply throat, and a discharge faceof angular form with its arm substantially at right angles to the discharge ends of the side ports, substantially as specified.

6. In an-automatic stoker, a blast casing having asupply throat, a central port and diverging side ports leading from the supply throat, and a spreading chamber of angular form arranged to receive the discharge from the ports and having its walls diverging rearwardly from the longitudinal median line of the casing, substantially as specified.

7. In an automatic stoker, a blast casing having a supply throat, a central port and diver ing side port-s leading from the supply 5110813, and a spreading chamber of angular form arranged to receive the discharge from the ports and having its walls substantially at right an les to the discharge ends of the side ports, su fied.

8. A blast casing for stokers comprising a supply throat, a spreading chamber provided with a dischar e slit, a central port and side ports leading from the supply throat to the spreading chamber, the central port being smaller in cross section than the side ports, substantially as specified.

9. A distributing plate for blast feed stokers having wide unobstructed central portion, and acomparatively narrow divergent channel at each side below the central portion of the-plate and discharging at the side of the plate 10. A distributing plate for blast feed stokers having anunobstructed central portion and divergent side channels lying below the central portion of the plate and gradually deepening from the receiving to the discharge end, substantially as speci ed.

11. A distributing plate for blast feed stokers having an unobstructed central portion and divergent side channels lying below the central portion of the plate and turned at their outer ends to a direction approximately at right angles to the longitudinal axis of the plate, substantially as specified.

12. 'A distributing plate for blast feed stokers having an unobstructed central portion and divergent side channels lying below the central portion of the plate, gradually deepening from the receiving to the discharge end and-turned at their outer ends to a direction approximately at right angles to i the longitudinal axis of the plate, substantially as specified.

13. A distributing plate for blast feed stokers havin its central portion sloping from a medial ine to either side and provided in its sides with divergent channels lying below the central portion of the plate and deepening from the receiving to the discharge end, substantially as s ecified.

14. A distributing plate f stokers having its central portion sloping from a medial line to either side and provided in its sides with divergent channels lying below the central portion. of the plate and turning abruptly at their outer ends toward the sides of the furnace, substantially as specified. a

15. A distributing plate for blast feed stokers havin its central portion sloping from a medialline to eitherside and provlded in its sides with divergent channels lying below the central portion of theplate, deepening from the receiving to the discharge end, and turning abruptly at their outer ends toward the sides of the furnace, substantially as specified.

16. In an automatic stoker, the combination of a distributing plate having side channels below the main surface of the plate and adapted to direct fuel toward the sides of the fire box, with a blast casing comprising a supply throat, a spreading chamber 1 5 provided with a discharge slit, a central or blast feed port and side ports leading from the supply throat to the spreading chamber, the central port being smaller in cross section than the side ports, substantially as specified.

17. In an automatic stoker, the combination of a distributing plate; means for feeding fuel to the rear of the plate; and means for discharging a blast-across the plate from the rear, the sides of the blast being of high pressure and divergently directed, and the center of lower pressure, substantially as specified,

18. In an automatic'stoker, the combination of a distributing plate; means for directing fuel to different portions of the plate; and means for discharging a blast across the plate from the rear, the sides of the blast bein of high pressure and divergently directe and the center of lower pressure, substantially asspecified.

19. In an automatic stoker, the combination of a distributing plate having side channels below the main surface, and adapted to direct fuel to the sides of the fire box; means for feeding fuel to the rear of the distributing plate; and means for discharging a blast across the plate from the rear, the sides of the blast being of high pressure and divergently directed and the center of lower pressure, substantially as specified.

20. In a blast feed stoker, the combination of a distributing plate having side channels below the main surface and adapted to direct fuel to the sides of the fire box; means for directing fuel to different portions of the plate and means for discharging a blast across the plate from the rear, the sides of the blast being of high pressure and divergently directed and the center of lower pressure, substantially as specified.

21. In an automatic stoker, the combination of a distributing plate having side channels below the. main surface and turned at their outer ends to a direction substantially at right angles to the median longitudinal line of the plate; means for feeding fuel to the rear of the distributing plate; and means for discharging a blast across the plate from the rear, the sides-of the blast being of high pressure and the center of lower pressure, substantially as specified.

22. In an automatic stoker, the combination of a distributing plate having side channels adapted to direct fuel to the sides of the fire box; a feed plate arranged to feed fuel'to the distributing plate, the feed plate being angular in cross section with its sides sloping downwardly from the median line; guide wings adjustable on the sloping sides; and means for discharging a blast across the distributing plate from the rear, the sides of the blast being of high pressure and the center of lower pressure, substantially as -&

23. In anautomatic Stoker, the combination of a distributing plate having an unobstructed central port-ion and divergent channels lying below the main surface of the plate, and turned at their outer ends to a direction substantially at right angles ,to the body of the plate; means for feeding fuel to the distributingplate from the rear; and means for discharging ablast across the plate from thetrear, the sides of the blastbeing of high pressure and the center of low pressure, substantially as specified.

24. In an automatic stoker, the combination of a distributing plate having an unobstructed central portion and divergent channels lying below the main surface of the" plate, and turned at their outer ends to a direction substantially at right angles to the body of the plate; means for feeding fuel to the distributing plate from the rear; a plate'arranged to feed fuel to the distributmg plate, the feed plate being angular in cross section with its sides slopin downwardly from themedian line; gui e wings adjustable on the sloping sides; and means for discharging a blast across the plate from the rear, the sides of the blast being of high pressure and the center of low pressure,

. substantially as specified.

WILLIAM T. HANNA.

Witnesses:

/ AGNES B. GRANT,

BRAYTON G. RICHARDS. 

